A Reaction-Based ESIPT Fluorescent Probe for the Detection of Hg with Large Stokes Shift.

J Fluoresc

Guangxi Key Laboratory of Health Care Food Science and Technology, College of Food and Bioengineering, Hezhou University, Hezhou, 542899, People's Republic of China.

Published: November 2023

A novel reaction-based fluorescent probe 1 for Hg was designed and synthesized. 1 was almost nonfluoresent due to inhibition of the ESIPT process between hydroxy group and imid carbonyl oxygen by diphenylphosphinothioate group. After reacting with Hg, the fluorescence intensity of 1 exhibited significant enhancement owing to recovery of the ESIPT process via Hg-promoted desulfurization-hydrolysis of the diphenylphosphinothioate moiety and cleavage of the P-O bond. 1 not only showed rapid response, high sensitivity, excellent selectivity for Hg over other metal ions, but also could detect Hg with large Stokes shift (165 nm), which was attributed to the ESIPT process. Moreover, the reaction mechanism was fully validated by absorption spectra, fluorescence spectra, fluorescence color as well as ESI-MS analysis. 1 is the reaction-based ESIPT fluorescent probe for the detection of Hg with large Stokes shift, rapid response, high sensitivity and selectivity.

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Source
http://dx.doi.org/10.1007/s10895-023-03508-5DOI Listing

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